aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/l2/l2_input_node.c
blob: 898e16ab347da21606a85090ba4f79f7dbb1d733 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
/*
 * l2_input.c : layer 2 input packet processing
 *
 * Copyright (c) 2013 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ethernet/packet.h>
#include <vnet/ip/ip_packet.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/fib/fib_node.h>
#include <vnet/ethernet/arp_packet.h>
#include <vlib/cli.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/l2_output.h>
#include <vnet/l2/feat_bitmap.h>
#include <vnet/l2/l2_bvi.h>
#include <vnet/l2/l2_fib.h>
#include <vnet/l2/l2_bd.h>

#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vppinfra/cache.h>

/**
 * @file
 * @brief Interface Input Mode (Layer 2 Cross-Connect or Bridge / Layer 3).
 *
 * This file contains the CLI Commands that modify the input mode of an
 * interface. For interfaces in a Layer 2 cross-connect, all packets
 * received on one interface will be transmitted to the other. For
 * interfaces in a bridge-domain, packets will be forwarded to other
 * interfaces in the same bridge-domain based on destination mac address.
 * For interfaces in Layer 3 mode, the packets will be routed.
 */

typedef struct
{
  /* per-pkt trace data */
  u8 dst_and_src[12];
  u32 next_index;
  u32 sw_if_index;
  u32 feat_mask;
} l2input_trace_t;

/* packet trace format function */
static u8 *
format_l2input_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  l2input_trace_t *t = va_arg (*args, l2input_trace_t *);

  s = format (s, "l2-input: sw_if_index %d dst %U src %U [%U]",
	      t->sw_if_index,
	      format_ethernet_address, t->dst_and_src,
	      format_ethernet_address, t->dst_and_src + 6,
	      format_l2_input_feature_bitmap, t->feat_mask, 0);
  return s;
}

extern l2input_main_t l2input_main;

#ifndef CLIB_MARCH_VARIANT
l2input_main_t l2input_main;
#endif /* CLIB_MARCH_VARIANT */

#define foreach_l2input_error			\
_(L2INPUT,     "L2 input packets")		\
_(DROP,        "L2 input drops")

typedef enum
{
#define _(sym,str) L2INPUT_ERROR_##sym,
  foreach_l2input_error
#undef _
    L2INPUT_N_ERROR,
} l2input_error_t;

static char *l2input_error_strings[] = {
#define _(sym,string) string,
  foreach_l2input_error
#undef _
};

typedef enum
{				/*  */
  L2INPUT_NEXT_LEARN,
  L2INPUT_NEXT_FWD,
  L2INPUT_NEXT_DROP,
  L2INPUT_N_NEXT,
} l2input_next_t;

static_always_inline void
classify_and_dispatch (l2input_main_t * msm, vlib_buffer_t * b0, u16 * next0)
{
  /*
   * Load L2 input feature struct
   * Load bridge domain struct
   * Parse ethernet header to determine unicast/mcast/broadcast
   * take L2 input stat
   * classify packet as IP/UDP/TCP, control, other
   * mask feature bitmap
   * go to first node in bitmap
   * Later: optimize VTM
   *
   * For L2XC,
   *   set tx sw-if-handle
   */

  u32 feat_mask = ~0;
  u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
  ethernet_header_t *h0 = vlib_buffer_get_current (b0);

  /* Get config for the input interface */
  l2_input_config_t *config = vec_elt_at_index (msm->configs, sw_if_index0);

  /* Save split horizon group */
  vnet_buffer (b0)->l2.shg = config->shg;

  /* determine layer2 kind for stat and mask */
  if (PREDICT_FALSE (ethernet_address_cast (h0->dst_address)))
    {
      u8 *l3h0 = (u8 *) h0 + vnet_buffer (b0)->l2.l2_len;

#define get_u16(addr) ( *((u16 *)(addr)) )
      u16 ethertype = clib_net_to_host_u16 (get_u16 (l3h0 - 2));
      u8 protocol = ((ip6_header_t *) l3h0)->protocol;

      /* Disable bridge forwarding (flooding will execute instead if not xconnect) */
      feat_mask &= ~(L2INPUT_FEAT_FWD |
		     L2INPUT_FEAT_UU_FLOOD |
		     L2INPUT_FEAT_UU_FWD | L2INPUT_FEAT_GBP_FWD);

      if (ethertype != ETHERNET_TYPE_ARP)
	feat_mask &= ~(L2INPUT_FEAT_ARP_UFWD);

      /* Disable ARP-term for non-ARP and non-ICMP6 packet */
      if (ethertype != ETHERNET_TYPE_ARP &&
	  (ethertype != ETHERNET_TYPE_IP6 || protocol != IP_PROTOCOL_ICMP6))
	feat_mask &= ~(L2INPUT_FEAT_ARP_TERM);
      /*
       * For packet from BVI - set SHG of ARP request or ICMPv6 neighbor
       * solicitation packet from BVI to 0 so it can also flood to VXLAN
       * tunnels or other ports with the same SHG as that of the BVI.
       */
      else if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
			      L2INPUT_BVI))
	{
	  if (ethertype == ETHERNET_TYPE_ARP)
	    {
	      ethernet_arp_header_t *arp0 = (ethernet_arp_header_t *) l3h0;
	      if (arp0->opcode ==
		  clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request))
		vnet_buffer (b0)->l2.shg = 0;
	    }
	  else			/* must be ICMPv6 */
	    {
	      ip6_header_t *iph0 = (ip6_header_t *) l3h0;
	      icmp6_neighbor_solicitation_or_advertisement_header_t *ndh0;
	      ndh0 = ip6_next_header (iph0);
	      if (ndh0->icmp.type == ICMP6_neighbor_solicitation)
		vnet_buffer (b0)->l2.shg = 0;
	    }
	}
    }
  else
    {
      /*
       * For packet from BVI - set SHG of unicast packet from BVI to 0 so it
       * is not dropped on output to VXLAN tunnels or other ports with the
       * same SHG as that of the BVI.
       */
      if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
			 L2INPUT_BVI))
	vnet_buffer (b0)->l2.shg = 0;
    }


  if (l2_input_is_bridge (config))
    {
      /* Do bridge-domain processing */
      /* save BD ID for next feature graph nodes */
      vnet_buffer (b0)->l2.bd_index = config->bd_index;

      /* Save bridge domain and interface seq_num */
      vnet_buffer (b0)->l2.l2fib_sn = l2_fib_mk_seq_num
	(config->bd_seq_num, config->seq_num);
      vnet_buffer (b0)->l2.bd_age = config->bd_mac_age;

      /*
       * Process bridge domain feature enables.
       * To perform learning/flooding/forwarding, the corresponding bit
       * must be enabled in both the input interface config and in the
       * bridge domain config. In the bd_bitmap, bits for features other
       * than learning/flooding/forwarding should always be set.
       */
      feat_mask = feat_mask & config->bd_feature_bitmap;
    }
  else if (l2_input_is_xconnect (config))
    {
      /* Set the output interface */
      vnet_buffer (b0)->sw_if_index[VLIB_TX] = config->output_sw_if_index;
    }
  else
    feat_mask = L2INPUT_FEAT_DROP;

  /* mask out features from bitmap using packet type and bd config */
  u32 feature_bitmap = config->feature_bitmap & feat_mask;

  /* save for next feature graph nodes */
  vnet_buffer (b0)->l2.feature_bitmap = feature_bitmap;

  /* Determine the next node */
  *next0 = feat_bitmap_get_next_node_index (msm->feat_next_node_index,
					    feature_bitmap);
}

static_always_inline uword
l2input_node_inline (vlib_main_t * vm,
		     vlib_node_runtime_t * node, vlib_frame_t * frame,
		     int do_trace)
{
  u32 n_left, *from;
  l2input_next_t next_index;
  l2input_main_t *msm = &l2input_main;
  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
  u16 nexts[VLIB_FRAME_SIZE], *next = nexts;

  from = vlib_frame_vector_args (frame);
  n_left = frame->n_vectors;	/* number of packets to process */
  next_index = node->cached_next_index;

  vlib_get_buffers (vm, from, bufs, n_left);

  while (n_left > 0)
    {
      while (n_left >= 8)
	{
	  u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;

	  /* Prefetch next iteration. */
	  {
	    /* Prefetch the buffer header and packet for the N+2 loop iteration */
	    vlib_prefetch_buffer_header (b[4], LOAD);
	    vlib_prefetch_buffer_header (b[5], LOAD);
	    vlib_prefetch_buffer_header (b[6], LOAD);
	    vlib_prefetch_buffer_header (b[7], LOAD);

	    CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, STORE);
	    CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, STORE);
	    CLIB_PREFETCH (b[6]->data, CLIB_CACHE_LINE_BYTES, STORE);
	    CLIB_PREFETCH (b[7]->data, CLIB_CACHE_LINE_BYTES, STORE);
	  }

	  classify_and_dispatch (msm, b[0], &next[0]);
	  classify_and_dispatch (msm, b[1], &next[1]);
	  classify_and_dispatch (msm, b[2], &next[2]);
	  classify_and_dispatch (msm, b[3], &next[3]);

	  if (do_trace)
	    {
	      /* RX interface handles */
	      sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
	      sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
	      sw_if_index2 = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
	      sw_if_index3 = vnet_buffer (b[3])->sw_if_index[VLIB_RX];

	      if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
		{
		  ethernet_header_t *h0 = vlib_buffer_get_current (b[0]);
		  l2input_trace_t *t =
		    vlib_add_trace (vm, node, b[0], sizeof (*t));
		  t->sw_if_index = sw_if_index0;
		  t->feat_mask = vnet_buffer (b[0])->l2.feature_bitmap;
		  clib_memcpy_fast (t->dst_and_src, h0->dst_address,
				    sizeof (h0->dst_address) +
				    sizeof (h0->src_address));
		}
	      if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
		{
		  ethernet_header_t *h1 = vlib_buffer_get_current (b[1]);
		  l2input_trace_t *t =
		    vlib_add_trace (vm, node, b[1], sizeof (*t));
		  t->sw_if_index = sw_if_index1;
		  t->feat_mask = vnet_buffer (b[1])->l2.feature_bitmap;
		  clib_memcpy_fast (t->dst_and_src, h1->dst_address,
				    sizeof (h1->dst_address) +
				    sizeof (h1->src_address));
		}
	      if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
		{
		  ethernet_header_t *h2 = vlib_buffer_get_current (b[2]);
		  l2input_trace_t *t =
		    vlib_add_trace (vm, node, b[2], sizeof (*t));
		  t->sw_if_index = sw_if_index2;
		  t->feat_mask = vnet_buffer (b[2])->l2.feature_bitmap;
		  clib_memcpy_fast (t->dst_and_src, h2->dst_address,
				    sizeof (h2->dst_address) +
				    sizeof (h2->src_address));
		}
	      if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
		{
		  ethernet_header_t *h3 = vlib_buffer_get_current (b[3]);
		  l2input_trace_t *t =
		    vlib_add_trace (vm, node, b[3], sizeof (*t));
		  t->sw_if_index = sw_if_index3;
		  t->feat_mask = vnet_buffer (b[3])->l2.feature_bitmap;
		  clib_memcpy_fast (t->dst_and_src, h3->dst_address,
				    sizeof (h3->dst_address) +
				    sizeof (h3->src_address));
		}
	    }

	  b += 4;
	  n_left -= 4;
	  next += 4;
	}

      while (n_left > 0)
	{
	  classify_and_dispatch (msm, b[0], &next[0]);

	  if (do_trace && PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      ethernet_header_t *h0 = vlib_buffer_get_current (b[0]);
	      l2input_trace_t *t =
		vlib_add_trace (vm, node, b[0], sizeof (*t));
	      t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
	      t->feat_mask = vnet_buffer (b[0])->l2.feature_bitmap;
	      clib_memcpy_fast (t->dst_and_src, h0->dst_address,
				sizeof (h0->dst_address) +
				sizeof (h0->src_address));
	    }

	  b += 1;
	  next += 1;
	  n_left -= 1;
	}
    }

  vlib_node_increment_counter (vm, l2input_node.index,
			       L2INPUT_ERROR_L2INPUT, frame->n_vectors);

  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);

  return frame->n_vectors;
}

VLIB_NODE_FN (l2input_node) (vlib_main_t * vm,
			     vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
    return l2input_node_inline (vm, node, frame, 1 /* do_trace */ );
  return l2input_node_inline (vm, node, frame, 0 /* do_trace */ );
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (l2input_node) = {
  .name = "l2-input",
  .vector_size = sizeof (u32),
  .format_trace = format_l2input_trace,
  .format_buffer = format_ethernet_header_with_length,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(l2input_error_strings),
  .error_strings = l2input_error_strings,

  .n_next_nodes = L2INPUT_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
       [L2INPUT_NEXT_LEARN] = "l2-learn",
       [L2INPUT_NEXT_FWD]   = "l2-fwd",
       [L2INPUT_NEXT_DROP]  = "error-drop",
  },
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */